>> president obama will be leaving washington to come to boston tomorrow. he is scheduled to come to a morning interfaith prayer service to honor the 183 people injured and three people killed on monday. >> reporting live in boston. ibm emily schmidt . >> as investigators pore over the scene we have pictures showing the second bomb right before it went off. this is courtesy of w.h. the age. it was seconds thed h. >> if it is not clear if the second one that exploded 100 yds down about 10 seconds after the first one was also a pressure cooker packed with nails and ball bearings. investigators are still trying to determine that. cnn reporting moments ago that the lid of a pressure cooker was found on the roof of a building on the street in boston. images here from hdh. on what appears to be the second explosive before it went off. >> a bay area boy, woman and a marathon bombing, is scheduled to undergo another surgery today. 11 year-old aaron hern of cortines, was near the finish line, carry on his mother was running in the race, when he was caught in one of